Stretch Blow Molding Defined

Stretch blow molding is the process of creating bottles (usually PET) that will be used for packaging various products, such as juices, dairy, water, etc. There are two main types of stretch blow molding: single-stage and two-stage. The following information will deal with two-stage stretch blow molding.

One of the main advantages of two-stage stretch blow molding is the process stretches the container in two directions. This biaxial stretching has several advantages. It increases the barrier properties, tolerance for drop impact, clarity, tensile strength and top load of the container. This increase in strength also allows for the reduction in material used while maintaining overall container strength. The result is a savings of 10% – 15% in material which translates into saving money.

The final bottle shape results from the combined actions of the longitudinal and circumferential stretches within the mold.

Why Are PET Bottles So Popular?

Light weight, durable, distinctivePet plastic containers are a popular choice for fillers due to the numerous benefits they provide both to manufacturers and consumers, in terms of design, costs reduction and convenience.